Labelmaster's National Fire Protection Association (NFPA®) Standard Labels are designed for easy identification of chemical hazards by firefighters and emergency responders who are concerned with burning, spilled or exploding materials. These safety labels meet the NFPA 704 standard and are printed with numerical ratings for health hazards, fire hazards, instability and specific hazards associated with a chemical under emergency fire or spill conditions. These 4 x 4-in. labels are printed on pressure-sensitive, weather-resistant vinyl and are sold in rolls of 100.